Forming welding device for manufacturing combustion chamber of turbojet engine

Abstract

The invention discloses a forming welding device for manufacturing a turbojet engine combustion chamber, and belongs to the technical field of welding machining. Two mounting plates are vertically mounted on the top wall of the base in a sliding manner, and clamping holes are formed in the side walls of the two mounting plates; a bracket is fixedly mounted on the side wall of the mounting plate; a driving mechanism for driving the two mounting plates to move synchronously is arranged on the base; an annular guide rail is arranged on the base, a mounting frame is slidably arranged on the annular guide rail in a sleeving mode, and a welding machine is arranged on the mounting frame. Due to the fact that the temperature of a welding part rises in the welding process, in the process that a rotating pipe drives a first exhaust hole to rotate, the inner wall of the welding part can be impacted through airflow, at the moment, under the action of heat exchange, the airflow can be heated, and high-temperature airflow in a closed combustion chamber preheats a low-temperature area through heat exchange; the whole temperature uniformity of the wall surface of the combustion chamber is effectively improved in the process, so that the temperature gradient is obviously reduced during welding, the thermal shock is inhibited, and the thermal stress is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding processing, more particularly, to a forming welding device for manufacturing a turbojet engine combustion chamber. BACKGROUND

[0002] The turbojet engine combustion chamber is a key component of the hot end of the engine, and the manufacturing quality thereof directly determines the performance, reliability and service life of the engine. The combustion chamber is usually formed by precisely welding thin plates of high-temperature alloy, and has a complex structure and thin wall, and works in an extreme environment of high temperature and high pressure. Therefore, extremely strict requirements are put forward for the quality, geometric precision and structural integrity of the welded joint.

[0003] In the welding process of the combustion chamber, a welding fixture is used to reliably fix and clamp the components in order to ensure the assembly precision. However, the heat generated during welding can cause a sharp rise in local temperature, resulting in significant thermal stress and uneven plastic strain, which inevitably causes the workpiece to shrink and deform. Especially for thin-walled combustion chambers, the structural rigidity is low, and the heat input is extremely sensitive. After the welding is completed and the fixture is released, these stresses will be redistributed in the form of residual stress, often causing unpredictable deformation.

[0004] Therefore, the forming welding device for manufacturing a turbojet engine combustion chamber is proposed. SUMMARY

[0005] In view of the problems in the prior art, the purpose of the present application is to provide a forming welding device for manufacturing a turbojet engine combustion chamber, which can reduce the temperature gradient during welding and reduce the probability of deformation.

[0006] To solve the above problems, the present application adopts the following technical solutions.

[0007] The forming welding device for manufacturing a turbojet engine combustion chamber comprises a base; Two mounting plates are vertically slidably installed on the top wall of the base, and clamping holes are formed in the side walls of the two mounting plates; a bracket is fixedly installed on the side wall of the mounting plate; And a driving mechanism for driving the two mounting plates to move synchronously is arranged on the base; An annular guide rail is arranged on the base, a mounting bracket is slidably sleeved on the annular guide rail, and a welding machine is arranged on the mounting bracket; An installation slot is formed in the side wall of the clamping hole, a disc is rotatably embedded in the installation slot, and a rotating mechanism for driving the disc to rotate is arranged on the mounting plate; A rotating pipe is horizontally fixedly installed on the side wall of the disc, first exhaust holes are uniformly formed in the side wall of the rotating pipe, and a gas supply mechanism for supplying gas to the rotating pipe is arranged on the base.

[0008] Further, the driving mechanism comprises a two-way threaded rod horizontally rotatably installed on the base, and two sliding blocks are threadedly installed on the two-way threaded rod; and the two sliding blocks are fixedly connected with one of the mounting plates respectively.

[0009] Further, the gas supply mechanism comprises an elastic bellows fixedly installed between the two mounting plates, and a pressurizing cavity is formed in the elastic bellows. A transfer bin is formed in the side wall of the mounting groove. A first air pipe is fixedly inserted in the side wall of the transfer bin, and the first air pipe extends into the pressurizing cavity. And the disc is fixedly embedded with a guide pipe in communication with the rotating pipe and the transfer bin respectively.

[0010] Further, the rotating mechanism comprises a turbine fixedly installed on the side wall of the disc, and the turbine is located in the transfer bin.

[0011] Further, the elastic bellows is made of a heat-insulating material.

[0012] Further, an annular guide flow cavity is formed in the annular guide rail, and a second exhaust hole in communication with the guide flow cavity is formed in the inner ring side of the annular guide rail.

[0013] Further, a second air pipe is inserted in the side wall of the clamping hole, and the first air pipe and the second air pipe are located on the two mounting plates respectively; and an end of the second air pipe away from the mounting plate extends to the bottom wall of the guide flow cavity.

[0014] Further, a cross bar is horizontally fixedly installed in the guide flow cavity, a spoiler is movably sleeved on the cross bar, the distance between the edge of the spoiler and the side wall of the guide flow cavity is 5-8 mm, and a shaking mechanism for shaking the spoiler is arranged on the annular guide rail.

[0015] Further, the shaking mechanism comprises a spring fixedly installed between the spoiler and the guide flow cavity, first magnets are uniformly embedded on the spoiler, and a second magnet repelling the first magnets is fixedly installed on the mounting frame.

[0016] Further, the surface of the spoiler is uniformly and obliquely provided with pressurizing holes.

[0017] Compared with the prior art, the present application has the following advantages: (1) Through the cooperation of the mounting plate, the rotating pipe and the gas supply mechanism, the inner wall of the welding position can be impacted by the airflow during the rotation of the rotating pipe driven by the first exhaust hole, and the airflow can be heated under the action of heat exchange, and the high-temperature airflow in the sealed combustion chamber can preheat the low-temperature area, which effectively improves the overall temperature uniformity of the combustion chamber wall surface, thereby significantly reducing the temperature gradient during welding, inhibiting thermal shock, achieving the effect of reducing thermal stress, and further reducing the probability of deformation of the combustion chamber.

[0018] (2) The second air pipe, the flow guide cavity and the second exhaust hole cooperate with each other, and the hot air in the pressurizing cavity is discharged into the flow guide cavity through the second air pipe, and then is uniformly discharged through the second exhaust hole, so that the welding position can be heated, and the temperature gradient of the welding position during welding is further reduced, and the probability of deformation of the combustion chamber is reduced.

[0019] (3) The elastic bellows is made of heat preservation material, when the welding is completed and the two mounting plates are away from each other, the elastic bellows is stretched, at this time, the pressurizing cavity absorbs high-temperature gas from the combustion chamber which has completed welding through the rotating pipe; when working again, the hot air flow discharged from the pressurizing cavity can preheat the combustion chamber to be welded, and the temperature change of the welding position at the moment of welding is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the left view structure of the present application; Figure 3 It is a schematic diagram of the front view structure of the present application; Figure 4 It is a schematic diagram of the structure of the present application Figure 3 It is a schematic diagram of the enlarged structure of A in the present application; Figure 5 It is a schematic diagram of the enlarged structure of B in the present application; Figure 3 It is a schematic diagram of the structure of the rotating pipe of the present application; Figure 6 It is a schematic diagram of the combination structure of the spoiler and the first magnet of the present application; Figure 7 It is a schematic diagram of the cross-sectional structure of the spoiler of the present application. Figure 8 Explanation of reference numerals in the drawing:

[0021] 1, base; 2, mounting plate; 3, bracket; 4, annular guide rail; 5, mounting frame; 6, welding machine; 7, disc; 8, rotating pipe; 9, first exhaust hole; 10, two-way threaded rod; 11, sliding block; 12, elastic bellows; 13, pressurizing cavity; 14, transfer bin; 15, first air pipe; 16, guide pipe; 17, turbine; 18, flow guide cavity; 19, second exhaust hole; 20, second air pipe; 21, cross rod; 22, spoiler; 23, spring; 24, first magnet; 25, second magnet; 26, pressurizing hole. DETAILED DESCRIPTION

[0022] ​With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described; obviously, the described embodiments are only a part of the embodiments of the present application, and not all the embodiments; based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0023] Embodiment 1:

[0024] Please refer to Figures 1 to 8 , the forming and welding device for manufacturing the combustion chamber of a turbojet engine comprises a base 1; Two mounting plates 2 are vertically and slidably installed on the top wall of the base 1, and a clamping hole is formed in the side wall of each mounting plate 2, and the two clamping holes are symmetrically arranged; a bracket 3 is fixedly installed on the side wall of the mounting plate 2, and the bracket 3 is used to hold the workpiece to be welded; And the base 1 is provided with a driving mechanism for driving the two mounting plates 2 to move synchronously; The base 1 is provided with an annular guide rail 4, and the annular guide rail 4 is curved from a cylindrical metal, so as to prevent the accumulated welding slag from falling on the surface of the annular guide rail 4, and a support is jointly installed between the bottom wall of the annular guide rail 4 and the base 1, the annular guide rail 4 is fixed at a specified position through the support, a mounting bracket 5 is slidably sleeved on the annular guide rail 4, and the mounting bracket 5 is a three-quarter circular ring, so that the mounting bracket 5 can be sleeved on the annular guide rail 4, and the support can pass through the opening of the mounting bracket 5, so that the mounting bracket 5 can move along the annular guide rail 4, and a welding machine 6 is arranged on the mounting bracket 5, and the welding machine 6 is started to uniformly push the mounting bracket 5 to move on the annular guide rail 4, so as to complete the welding; A mounting groove is formed in the side wall of the clamping hole, and a disc 7 is rotatably embedded in the mounting groove, and a rotating mechanism is arranged on the mounting plate 2 for driving the disc 7 to rotate; A rotating pipe 8 is horizontally and fixedly installed on the side wall of the disc 7, and a plurality of first exhaust holes 9 are uniformly formed in the side wall of the rotating pipe 8, and a gas supply mechanism is arranged on the base 1 for supplying gas to the rotating pipe 8.

[0025] For the cylindrical combustion chamber, it usually comprises two cylindrical shells with one end open, and during processing, first, the parts are installed in the shells, and then the open ends of the two shells are welded together.

[0026] First, the two parts to be welded together are respectively placed on the bracket 3, and the open end of the workpiece is inserted into the clamping hole, and at the same time, the rotating pipe 8 is inserted into the workpiece.

[0027] Then, the driving mechanism drives the two mounting plates 2 to move close to each other until the two workpieces are tightly fixed together.

[0028] When the two mounting plates 2 are close to each other, under the action of the gas supply mechanism, the rotating pipe 8 continuously discharges gas outward through the first exhaust hole 9.

[0029] The welding machine 6 is restarted, and the mounting frame 5 is pushed to move along the annular guide rail 4, in the process, the welding machine 6 welds the connecting part of the two workpieces together, thereby realizing welding.

[0030] In the welding process, the rotating mechanism drives the disc 7 to rotate, and at this time, the rotating pipe 8 drives the first exhaust hole 9 to rotate.

[0031] Because the temperature of the welding part rises during welding, during the rotation of the rotating pipe 8 and the first exhaust hole 9, the inner wall of the welding part can be impacted by the airflow, at this time, under the action of heat exchange, the airflow can be heated, and the high-temperature airflow in the sealed combustion chamber preheats the low-temperature area through heat exchange. This process effectively improves the overall temperature uniformity of the combustion chamber wall surface, thereby significantly reducing the temperature gradient during welding, inhibiting thermal shock, achieving the effect of reducing thermal stress, and further reducing the probability of deformation of the combustion chamber.

[0032] As shown in Figure 3 , the driving mechanism includes a bidirectional threaded rod 10 horizontally rotatably mounted on the base 1, and two sliding blocks 11 are threadedly mounted on the bidirectional threaded rod 10; and a guide rod is horizontally fixedly mounted on the base 1, and the two sliding blocks 11 are movably sleeved on the guide rod, thereby preventing the sliding blocks 11 from rotating, when the bidirectional threaded rod 10 is forward rotated, the two sliding blocks 11 threadedly mounted on the bidirectional threaded rod 10 are close to each other; when the bidirectional threaded rod 10 is reversely rotated, the two sliding blocks 11 are away from each other; The two sliding blocks 11 are fixedly connected with one of the mounting plates 2, and the bottom wall of the mounting plate 2 is attached to the bottom wall of the base 1, thereby limiting the sliding blocks 11 and preventing the sliding blocks 11 from rotating, thereby moving the mounting plate 2 through the sliding blocks 11, and achieving the effect of driving the mounting plate 2 to move.

[0033] As shown in Figure 3 , the gas supply mechanism includes an elastic bellows 12 fixedly mounted between the two mounting plates 2, and a pressurizing cavity 13 is formed in the elastic bellows 12; A transfer bin 14 is formed in the side wall of the mounting groove; A first gas pipe 15 is fixedly inserted in the side wall of the transfer bin 14, and the first gas pipe 15 extends into the pressurizing cavity 13; And the disc 7 is fixedly embedded with a conduit 16 having two ends communicated with the rotating pipe 8 and the transfer bin 14.

[0034] The elastic bellows 12 is made of heat-insulating material, and when the welding is completed and the two mounting plates 2 are away from each other, the elastic bellows 12 is stretched, at this time, the pressurized cavity 13 absorbs high-temperature gas from the completed welding combustion chamber through the rotating pipe 8; when working again, the hot gas flow discharged from the pressurized cavity 13 can preheat the combustion chamber to be welded, thereby reducing the temperature change of the welding position at the moment of welding.

[0035] When the two mounting plates 2 are close to each other, the elastic bellows 12 is squeezed, at this time, the gas in the pressurized cavity 13 is discharged into the transfer bin 14 through the first gas pipe 15, and then flows into the rotating pipe 8 through the guide pipe 16, thereby playing a role of supplying gas to the rotating pipe 8.

[0036] As shown in Figure 4 , the rotating mechanism includes a turbine 17 fixedly installed on the side wall of the disc 7, the turbine 17 is located in the transfer bin 14, and the gas discharged from the first gas pipe 15 directly impacts the turbine 17, at this time, the turbine 17 rotates and drives the rotating disc to rotate, thereby playing a role of driving the rotating pipe 8 to rotate.

[0037] As shown in Figure 5 , the annular guide rail 4 is provided with an annular flow guide cavity 18, and the inner ring side of the annular guide rail 4 is provided with a second exhaust hole 19 in communication with the flow guide cavity 18.

[0038] The side wall of the clamping hole is inserted with a second gas pipe 20, and the first gas pipe 15 and the second gas pipe 20 are located on the two mounting plates 2 respectively; the end of the second gas pipe 20 away from the mounting plate 2 extends to the inner bottom wall of the flow guide cavity 18, and the ratio of the inner diameters of the first gas pipe 15 and the second gas pipe 20 is 1.5-2.

[0039] The high-temperature gas in the combustion chamber in the welding state is discharged into the flow guide cavity 18 through the second gas pipe 20, and then uniformly discharged through the second exhaust hole 19, thereby being able to heat the welding position, further reducing the temperature gradient of the welding position during welding, and reducing the probability of deformation of the combustion chamber.

[0040] And under the action of the mounting frame 5, the gas discharged from the second exhaust hole 19 can be prevented from directly impacting the welding position, thereby playing a role of ensuring that the welding work can be normally carried out.

[0041] As shown in Figure 5 , a crossbar 21 is horizontally and fixedly installed in the flow guide cavity 18, a spoiler 22 is movably sleeved on the crossbar 21, the edge of the spoiler 22 is spaced apart from the side wall of the flow guide cavity 18 by 5-8 mm, and the annular guide rail 4 is provided with a shaking mechanism for shaking the spoiler 22.

[0042] The shaking mechanism comprises a spring 23 fixedly installed between the spoiler 22 and the flow guide cavity 18, the spoiler 22 is uniformly embedded with first magnets 24, and the mounting frame 5 is fixedly installed with second magnets 25 repelling the first magnets 24, wherein the adjacent ends of the first magnets 24 and the second magnets 25 repel each other.

[0043] During the movement of the mounting frame 5 along the annular guide rail 4, the first magnets 24 and the second magnets 25 are intermittently in the same horizontal line; when the first magnets 24 and the second magnets 25 are in the same horizontal line, the first magnets 24 drive the spoiler 22 to slide along the crossbar 21 under the repulsion force, and the spring 23 is compressed; when the first magnets 24 and the second magnets 25 are misaligned, the spring 23 restores, and the spoiler 22 shakes back and forth along the crossbar 21 under the action of its own inertia, so that the spoiler 22 continuously shakes during the movement of the mounting frame 5, thereby stirring the gas in the flow guide cavity 18, increasing the probability of the gas in the second air pipe 20 being discharged through the second exhaust hole 19 around the welding site, and improving the preheating effect on the welding site.

[0044] As shown in Figure 8 the surface of the spoiler 22 is uniformly inclined to form pressurizing holes 26.

[0045] When the spoiler 22 moves along the crossbar 21, the spoiler 22 hits the gas and the gas passes through the pressurizing holes 26, at this time, the gas flow direction is changed under the action of the pressurizing holes 26, thereby accelerating the diffusion speed of the gas in the flow guide cavity 18, and ensuring that the high-temperature gas discharged from the second exhaust pipe can timely fill the flow guide cavity 18.

[0046] Method for use: for the cylindrical combustion chamber, generally comprising two cylindrical shells with one end open, during processing, first install parts in the shell, then weld the open ends of the two shells together.

[0047] First, place the two parts to be welded together on the bracket 3 respectively, and insert the open end of the workpiece into the clamping hole, at the same time, rotate the pipe 8 to insert into the workpiece.

[0048] Then drive the two mounting plates 2 to approach each other by the driving mechanism until the two workpieces to be welded are attached, at this time, the two mounting plates 2 tightly fix the two workpieces together.

[0049] When the two mounting plates 2 approach each other, the rotating pipe 8 continuously discharges outward through the first exhaust hole 9 under the action of the air supply mechanism.

[0050] Then start the welding machine 6 and push the mounting frame 5 to move along the annular guide rail 4, during this process, the welding machine 6 welds the connection of the two workpieces together, thereby realizing welding.

[0051] In the welding process, the rotating mechanism drives the disc 7 to rotate, and at this time, the rotating tube 8 drives the first exhaust hole 9 to rotate.

[0052] Since the temperature of the welding part rises in the welding process, the airflow can impact the inner wall of the welding part during the rotation of the rotating tube 8 driving the first exhaust hole 9, at this time, the airflow can be heated under the action of heat exchange, and the high-temperature airflow in the sealed combustion chamber preheats the low-temperature area through heat exchange, which effectively improves the overall temperature uniformity of the combustion chamber wall surface, thereby significantly reducing the temperature gradient during welding, inhibiting thermal shock, achieving the effect of reducing thermal stress, and further reducing the probability of deformation of the combustion chamber. During the movement of the mounting frame 5 along the annular guide rail 4, the first magnet 24 and the second magnet 25 are intermittently in the same horizontal line; when the first magnet 24 and the second magnet 25 are in the same horizontal line, under the action of repulsion, the first magnet 24 drives the spoiler 22 to slide along the crossbar 21, and the spring 23 is compressed; when the first magnet 24 and the second magnet 25 are misaligned, the spring 23 recovers, and under the action of the inertia of the spoiler 22 itself, the spoiler 22 shakes back and forth along the crossbar 21, so that the spoiler 22 continuously shakes during the movement of the mounting frame 5, thereby being able to agitate the gas in the flow guide cavity 18, increasing the probability of the gas discharged from the second gas pipe 20 being discharged through the second exhaust hole 19 around the welding part, and improving the preheating effect on the welding part.

[0053] The above is only a preferred specific embodiment of the present application; however, the protection scope of the present application is not limited thereto. Any person skilled in the art can make equivalent replacements or changes to the technical solutions and improved concepts of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A forming and welding apparatus for manufacturing a turbojet engine combustion chamber, comprising a base (1); Its features are: Two mounting plates (2) are vertically slidably installed on the top wall of the base (1), and each mounting plate (2) has a locking hole on its side wall; a bracket (3) is fixedly installed on the side wall of the mounting plate (2). Furthermore, the base (1) is provided with a drive mechanism for driving the two mounting plates (2) to move synchronously; The base (1) is provided with an annular guide rail (4), and a mounting bracket (5) is slidably sleeved on the annular guide rail (4). A welding machine (6) is provided on the mounting bracket (5). The side wall of the card hole is provided with an installation groove, and a disc (7) is rotatably embedded in the installation groove. The mounting plate (2) is provided with a rotating mechanism for driving the disc (7) to rotate. A rotating tube (8) is horizontally fixed on the side wall of the disc (7). A first exhaust hole (9) is evenly opened on the side wall of the rotating tube (8). An air supply mechanism for supplying air to the rotating tube (8) is provided on the base (1).

2. The forming and welding apparatus for manufacturing a turbojet engine combustion chamber according to claim 1, characterized in that: The drive mechanism includes a bidirectional threaded rod (10) that is horizontally rotatably mounted on a base (1), and two sliders (11) are threadedly mounted on the bidirectional threaded rod (10); the two sliders (11) are respectively fixedly connected to one of the mounting plates (2).

3. The forming and welding apparatus for manufacturing a turbojet engine combustion chamber according to claim 2, characterized in that: The gas supply mechanism includes an elastic bellows (12) fixedly installed between two mounting plates (2), and a pressurization chamber (13) is provided on the elastic bellows (12). A transfer compartment (14) is provided on the side wall of the installation slot. A first air pipe (15) is fixedly inserted into the side wall of the transfer chamber (14), and the first air pipe (15) extends into the pressurization chamber (13); Furthermore, the disc (7) is fixedly embedded with a conduit (16) whose two ends are respectively connected to the rotating tube (8) and the transfer chamber (14).

4. The forming and welding apparatus for manufacturing a turbojet engine combustion chamber according to claim 3, characterized in that: The rotating mechanism includes a turbine (17) fixedly mounted on the side wall of the disk (7), the turbine (17) being located in the transfer compartment (14).

5. The forming and welding apparatus for manufacturing a turbojet engine combustion chamber according to claim 4, characterized in that: The elastic corrugated pipe (12) is made of thermal insulation material.

6. The forming and welding apparatus for manufacturing a turbojet engine combustion chamber according to claim 5, characterized in that: The annular guide rail (4) has an annular flow guide cavity (18), and the inner ring side of the annular guide rail (4) has a second exhaust hole (19) that communicates with the flow guide cavity (18).

7. The forming and welding apparatus for manufacturing a turbojet engine combustion chamber according to claim 6, characterized in that: A second air tube (20) is inserted into the side wall of the card hole. The first air tube (15) and the second air tube (20) are respectively located on two mounting plates (2). The end of the second air tube (20) away from the mounting plate (2) extends to the bottom wall of the guide cavity (18).

8. The forming and welding apparatus for manufacturing a turbojet engine combustion chamber according to claim 7, characterized in that: A horizontal bar (21) is fixedly installed in the flow guide cavity (18). A spoiler (22) is movably sleeved on the horizontal bar (21). The distance between the edge of the spoiler (22) and the side wall of the flow guide cavity (18) is 5-8 mm. A shaking mechanism for shaking the spoiler (22) is provided on the annular guide rail (4).

9. The forming and welding apparatus for manufacturing a turbojet engine combustion chamber according to claim 8, characterized in that: The shaking mechanism includes a spring (23) fixedly installed between the spoiler (22) and the guide cavity (18), a first magnet (24) is uniformly embedded on the spoiler (22), and a second magnet (25) that repels the first magnet (24) is fixedly installed on the mounting bracket (5).

10. The forming and welding apparatus for manufacturing a turbojet engine combustion chamber according to claim 9, characterized in that: The surface of the spoiler (22) is evenly inclined and has pressure holes (26).

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